There have been many remarkable responses to the attacks in Paris last week that left 17 people dead, from the national anthem being sung in the French parliament for the first time in 100 years, to the candlelit vigils held around the world in solidarity with the fallen.

However, perhaps the most uplifting is this crowd at a Unity rally in the French capital on Sunday singing John Lennon’s "Imagine". The music was played from a window above the streets, with the crowd spontaneously joining in. After the famed final line, “I hope someday you'll join us, and the world will live as one,” the crows burst into applause.